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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6415c4e7ef1730c7342d0d903949a1f1a8871ef1514248d02d37f1f79bb4f41' 
  AND token = 'Ya5HYiN1BL+U5nQJplonYtwntIrlBV4Ass45oYde9A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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