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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e79ff01e1b1da60692e762c0c560e748fa84eb0dcffb3b5fc4b7bda1a5cd018' 
  AND token = 'ynBvh1JXZC7Cq6o5EzzEnysUCBRLLgcBbbI0R5wGUyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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