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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89c61f634ffafcf0d8353b9e6702ebb41d67e73f13e18373183276c07831387' 
  AND token = '9Fg1s0+wUp7mauDubQ1E9ZchtFN+m7tWenvCAiFa6uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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