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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf2d16cc8393df19d5c6765ac5531987b1aa7bfd483222520320deef1a2846f' 
  AND token = '8UrdIwwqQ2feZseNwt8yL4uO1dmHYOWZVmvOd4xZX+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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