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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f09a822cabcceb1760328b15a6da660a9a2f312d59b0ade762212d764b4ad5b' 
  AND token = 'ysKJ3pAkaopfJe+VetPjUH7CXBn6N/KT1fMRmnrTMhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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