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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8759127b890abbb09f35f9a75811a380092c9d707ec491ec4b5854145a17544' 
  AND token = 'YBKSfsZMfUuSXpFy37GdKukxH5/CLMe+T9vM85Jj4zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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