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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780217c0773a46bdbf56df956c5d7714c2e4be63a2a9cfeabbc5287670fa6f6d' 
  AND token = 'TaQFQTBRKdv0/2rMKEyU7VhOEH4jaawluwtv4w01xb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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