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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390e83fe73c3136cd0e18beb862725909a4ce1d1c875e3d50491124702bc7c3e' 
  AND token = 'cZ5X/M8K27x+nnOdKkNSkqXREddIWCiTlCDhWuPP8yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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