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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730cb17967707681afe19c62bad18cd636d86fc43d0fddead415bf56d56eeb2d' 
  AND token = 'kCI53atOWwAaqU8iKmw0bg65UPC7Pv6j+kK72yTuVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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