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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bd2f4d66172cee84033c9dcfc8afa4a2eef26614d52f8bed750cd3bbc106fa' 
  AND token = 'NGGUkKNvnsRrDjQG68tt2Pth8iJD8BdlFu3ZfR8/2GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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