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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd501a5f4005e9b1966e5662a1e0d5b95f59d07735003a9f238f41f121ea958f6' 
  AND token = 'oQSLWYFHwzqbIZ0qmDbea3VuBF9PI2zy3XqwiX13dwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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