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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67998f26280b43f760406a9a6a4334de94e7adbcbcdc0dca614ebc8e50e47d77' 
  AND token = 'j+ACecSA2Dge+3MtEIfQQteC6zWbsSEcgmrxd5FywEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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