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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e432e994a53d5c14958a5f8a8610169e19e8d6a5cbf9ffd359ffb779c909d4' 
  AND token = 'UgZq9askrcYqe1efKd3a9FzeSOofzbav7Sllg7y3aYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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