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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9074a1184e6ce143b9a36959153897694d3a44d1a9f9095606dd133885348d94' 
  AND token = 'HGeisi7tYQzppUgPaX9Qr4xeD08gNUKoPfQKHWQNeYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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