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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a08625a05fc23ce5a397d6f8e28cf276270d3464456460682728d5d2f8774e7' 
  AND token = '/7YS3qZJuOr1r34AlBLsxRVY3GxGPM46zcsQRWKn2e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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