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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77cf3aeada58938d97623933c0e49dd6693a67ba3c364f35cd9be1630575762' 
  AND token = 'IGnj0vyB6RO4agcpQmdo8AtYCvmL2IPiNczH/skOqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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