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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95b77fc232bd6e2fa93eb2724208ea6d403569a08c454afd9d58975c60d9bb3' 
  AND token = '514ASW1wKpT8Gdf9a6k3G3pPn3IzTPSTmBCnP/B4PT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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