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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca98dd603d548502d475d51608547090b16160f00622605d73e9add85962582' 
  AND token = 'N1hoOO6jsxbXpzJo6XpDttIwgjYd+CWb0LZBZQ8sehk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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