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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cd355135136a3f315de7f28de2728fae409a4a06fc19c386b2fb51043431e1' 
  AND token = 'K84PERA+VcETwFVf7q7Z7PWN9bkgYaAKZSGywxecbkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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