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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd580dd3dc01d4f2b0475196968c5647ad4f81f7f1fda386e4dd8b27e56038f5c' 
  AND token = 'y4uJ5L/Ft5K4zW3ohFUfpP7BLmw+JlfpSx6Bm/uc74g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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