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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324f3c62e3e037f8ac4073f217d902077e03d408afb2b98af1677fdf07ae58c4' 
  AND token = 'JJBz7qpK8PooVAg1sMg9a8sDV/Sznc5pvhQpf4rtp6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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