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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5342db44e1bdb493f6f60a74b836722be5d315851fbecdd195f4297405104da2' 
  AND token = 'xJnesUuNHk7m1s5/VEwS9HgmYD1NFet4dPwMebCzFZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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