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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6054e4d90f59a5c0ae59c22c6a8f65fefa7b4ce52566bcedb96a441ad468715f' 
  AND token = '0PwHDf56642oKIYw/RXhDZ9ZhxXGxdrK/6jm4pDHWfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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