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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034853f7a26ba2b4a5e2580193aab42361e42573ba773455384a8f600cce4405' 
  AND token = 'tUJK4g/qFJaq8vVbeeMzbUgOojDytSFt2xkccE9aCCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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