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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945b0eb5c13c397e074c7eaf7975cf77ae23d1df0ce2bcfc8433542d9d29ce19' 
  AND token = 'XSyFi622fbPuppBydySbRzetrFl6I19yq8QBCKpq2c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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