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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92f46b66c6f450573e38168e604f974f92e6e1d5f2f1631bb8c5cda06b60b5f' 
  AND token = 'WtcSttRBLqwaQMAqW1MgsE9F9aePDhU8kVmbFHOnr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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