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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd35b2ad231968b6a8003eb44263e9f940fc22e743ad65a2bd91c84087bdac24' 
  AND token = 'srxeDj3ljeJKNVgAF9JzlCAJ8610LynrY8HEEI2x6UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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