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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06107de4df1a901bf76a0e28cb0d76e6f824c64b2d51f49261ee9b44d0c6dec3' 
  AND token = 'fW4b5avsjWM34AxIolZ/6KVAGjOcNtIBKiFTnE66Y84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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