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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70c433d2e023e200274c968edd1ee5d7b95a68a416a58d976e8c8e3054697d0' 
  AND token = 'QDtaLOdD7rRCuXr1EYV5e0ufs17XF3VFlsBGzgoLxf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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