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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fcda88b687e54b64dd49b5d32cfb073c1c2aa8fbef7c24e33c930e8099b910' 
  AND token = 'c0tHskmkSa26swX3n09N7t852A0Eb1Z2yoGCrLFKX9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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