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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea25293e0ba434c46e4b0b1acde5bb340419712bd91c0c4c25423666cef07ee' 
  AND token = 'Pb3Tx9k3tym1MsoAbk8veSL3AffEhvNUlDTLU3wWFdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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