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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b86b719492bd46171f7721c5ee7cbade89ee89a7b68a9c47ec9742ae7d2c5ef' 
  AND token = '/XlTfq5s3mOdVw9huUYQFLHQoF9buPr7dT9RDOux+Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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