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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fbd714ecac0e8eb5f9fae0c6834842dcd0af1875fed926ca812a7b79019979' 
  AND token = 'Hzco5AYcJr+wGxlHVD8EPME1Fn9T5OaUOq5hLGfCe6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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