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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9172f1fc5f6aa52fa2c545c9187f2b1161396baa17b64ca7abe2627b59208d5c' 
  AND token = 'h3j3OeygnuQC9q6aiDLO9eEDQyELY7xG8x4QcwzPX7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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