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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a58f9a9013063196b20a8d6e9893e9b74c9dcbae0b1ddfeff6ee117578c25cd' 
  AND token = 'uRUdGrUkbIwWXGmMUderr5BxZ5dIgieJBtS2KE3+QY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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