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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a136391d1b893c36087038d790a48dfc44137f26f95e5e170769430ab568f31' 
  AND token = 'S8vOI1ykbKa/GQzug44qX+nI0ZvLNppLLvKfJS3JdF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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