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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276719718d90c61479a34cf59a7cdeae1415e04d9f33a51134047ae1502d01f2' 
  AND token = 'sRjntGdLiou6sA3MOGKw61g3g+0Uj+hKxXIlr4nJmJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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