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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36e98cd28aac343be9462a816bf9df4df206a8eae8928e8a0bd82fa72c3acb5' 
  AND token = 'TJryphCBfBjS6cBokwT6R67hMtA+Vl7B9OzjyP8FjIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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