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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b394630154485ac0ed01a5e99f92bf9ed8f9d7f70d69861b911a4a1236054e1c' 
  AND token = 'dvH9MljWG3KpzxsJSUjGjvdF4Xl76PyljvwAF7sV83k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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