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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a1f3ae8cd76b49154f24ea329c2af504cccb39d906d73a95ece369706b0164' 
  AND token = 'i9MusRKv4NzsTf8QrCRnkFEUr3nRwTJuTKZddKo9aXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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