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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefb2ebae62d9874ba3834bcc008bedfa0b97e7898c47183e5f25453c7aa3fc7' 
  AND token = '3bM7goFej3mXFn6BRixQIfqrkXc3yV7j3wiTe8H5SF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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