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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7515608ad65f45743d435fdbe9dfb62238d5a085b4b6c8beb8c541998b704c4d' 
  AND token = 'O7gsaO6ZiMAP2Dq3rBuqFLmMq6PXzBjrLRc6FjBz+c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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