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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd191795bd1f293263689c8acfb4fc0af0206653a5a67edc4c5758a9b6a116ed1' 
  AND token = 'eB22Vxoz9WFRblxTddgnGVr+z+F/RKY8oe/cdUy+RGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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