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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d12ddb2e180baa5daef4a76ff772092d30f39053f2b105c0aea0e4e2242f380' 
  AND token = 'A63sCaIczepcW6A9vRqeH2R7AMPZBAL9Pt6A0tfTVzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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