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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94bac810b20cd113ed44adc4ddb64cb6a8e2d2f175329105eddf00f3c9c23e2' 
  AND token = 'Wgp4X5RJFT8zBErv50U3fS1nSwBnVtXVlTEF6HS4Y/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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