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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc417169205c6db794e28ded05e1344750996ee55c1d55cc669a282c37abf65e' 
  AND token = 'HW2gAngCmYmgYTxe0+A0YMMOzymyQX0LS9fQJEtHREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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