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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c613a0df38d04b46c296ed1e82226d40dad476a541f96a4cc2b6b7bcddfb6d8a' 
  AND token = 'fTHnpkMqgvDv+LZc4kJxbW2Sl4wda+C4/p6U3prbLIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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