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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea40598b0418657362559fc1a06da07607c6632c6fb04aeacaa60e16ee68fdb' 
  AND token = '74haqnzwdtDobfc0/0/oJEYfeDk+F2fmh0hynOadrhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}